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Finding the Fourth Proportional to 154.00, 212.45 and 98.73

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Solution

The fourth proportional to 154.00, 212.45 and 98.73 is: 136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.00 : 212.45 = 98.73 : x
  2. Step 2: Convert to fraction form
    154.00/212.45 = 98.73/x
  3. Step 3: Cross multiply
    154.00x = 212.45 × 98.73
  4. Step 4: Simplify right side
    154.00x = 20,974.69
  5. Step 5: Solve for x
    x = 20,974.69/154.00
  6. Step 6: Final answer
    x = 136.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.